NR ZDCB

AU Sament,S.; Alderete,J.F.; Schwab,R.S.

TI The persistence of the electroretinogram in patients with flat isoelectric EEGs

QU Electroenceph. clin. Neurophysiol. 1969; 26: 117-121

PT article review

AB The retinal potentials were found to be present in isoelectric (flat) EEG records in patients on a respirator, showing no reflexes or spontaneous breathing and no response to noise or pinch, clinically or in EEG. Arfel described 4 such patients in whom a response evoked by a flash of light could be found in frontal leads and nowhere else, with the use of a CAT computer. She identified this as the electroretinogram (ERG). We have been able to obtain the ERG with flashes from 1 to 100/sec in the first 10 patients of this type that were investigated. The usual stroboscope and EEG machine were used, without rcourse to the average transient or other computers, and the ERG responses were clearly seen in the routine ink-trace EEGs. The ERG, obtained this way, was present only in areas in proximity to the eyes, such as the frontal and central leads and from leads over the eyelids. No responses were present from the occipital leads. The latencies in the ERG correspond to those described by Monnier. The ERG potentials are derived mainly from the retinal receptor cells, which are more resistant to anoxia than neuronal cells. The ERG patterns observed in those patients who have had cardiac arrest correspond to the ERG described in patients with circulatory disturbances of the retina and to the ERG of the cone type of retina.

SP en

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